Fullstory API typescript definitions

fullstory.d.ts

interface Fullstory {
    identify(uid: string, userVars?: object): void;
    setUserVars(userVars: object): void;
    getCurrentSessionURL(now?: boolean): string;
    log(msg: string): void;
    log(level: string, msg: string): void;
    shutdown(): void;
    restart(): void;
    consent(consent: boolean): void;
    event(eventName: string, eventProperties: object): void;
    anonymize();
}

declare var FS: Fullstory;

Per the property name requirements we can refine the type for FS.event a bit more:

event(
  eventName: string,
  eventProperties:
    | { [key: `${string}_str`]: string }
    | { [key: `${string}${'_int' | '_real'}`]: number }
    | { [key: `${string}_date`]: Date }
    | { [key: `${string}_bool`]: boolean }
    | { [key: `${string}_strs`]: string[] }
    | { [key: `${string}${'_ints' | '_reals'}`]: number[] }
    | { [key: `${string}_dates`]: Date[] }
    | { [key: `${string}_bools`]: boolean[] }
): void;

These restrictions seem to apply similarly for FS.setUserVars and FS.identify with a few exceptions for "reserved properties", you could add those too and it would look something like this:

setUserVars(
  properties:
    | { [key: `${string}_str`]: string }
    | { [key: `${string}${'_int' | '_real'}`]: number }
    | { [key: `${string}_date`]: Date }
    | { [key: `${string}_bool`]: boolean }
    | { [key: `${string}_strs`]: string[] }
    | { [key: `${string}${'_ints' | '_reals'}`]: number[] }
    | { [key: `${string}_dates`]: Date[] }
    | { [key: `${string}_bools`]: boolean[] }
    | 'uid'
    | 'displayName'
    | 'email'
    | 'acctId'
    | 'website'
): void;

Of course, we can take advantage of some aliases to clean this all up a bit. The final result would be more like so:

type TypedFSPropertyNames =
  | { [key: `${string}_str`]: string }
  | { [key: `${string}${'_int' | '_real'}`]: number }
  | { [key: `${string}_date`]: Date }
  | { [key: `${string}_bool`]: boolean }
  | { [key: `${string}_strs`]: string[] }
  | { [key: `${string}${'_ints' | '_reals'}`]: number[] }
  | { [key: `${string}_dates`]: Date[] }
  | { [key: `${string}_bools`]: boolean[] };

type ReservedFSPropertyNames =
  | 'uid'
  | 'displayName'
  | 'email'
  | 'acctId'
  | 'website';

type Fullstory = {
  identify(
    uid: string,
    userVars?: TypedFSPropertyNames & ReservedFSPropertyNames
  );
  setUserVars(properties: TypedFSPropertyNames & ReservedFSPropertyNames): void;
  getCurrentSessionURL(now?: boolean): string;
  log(msg: string): void;
  log(level: string, msg: string): void;
  shutdown(): void;
  restart(): void;
  consent(consent: boolean): void;
  event(eventName: string, eventProperties: TypedFSPropertyNames): void;
};

declare var FS: Fullstory;